FFmpeg: AACDecContext Struct Reference

FFmpeg

main AAC decoding context More...

#include <aacdec.h>

Data Fields
const struct AVClass *	class

struct AVCodecContext *	avctx

struct AVFrame *	frame

int	is_saved
	Set if elements have stored overlap from previous frame. More...

DynamicRangeControl	che_drc

enum AACOutputChannelOrder	output_channel_order

OutputConfiguration	oc [2]

int	warned_num_aac_frames

int	warned_960_sbr

unsigned	warned_71_wide

int	warned_gain_control

int	warned_he_aac_mono

void(*	imdct_and_windowing )(struct AACDecContext ac, SingleChannelElement sce)

void(*	apply_ltp )(struct AACDecContext ac, SingleChannelElement sce)

void(*	apply_tns )(INTFLOAT coef[1024], TemporalNoiseShaping tns, IndividualChannelStream ics, int decode)

void(*	windowing_and_mdct_ltp )(struct AACDecContext ac, INTFLOAT out, INTFLOAT in, IndividualChannelStream ics)

void(*	update_ltp )(struct AACDecContext ac, SingleChannelElement sce)

void(*	vector_pow43 )(int *coefs, int len)

void(*	subband_scale )(int dst, int src, int scale, int offset, int len, void *log_context)

Channel element related data
ChannelElement *	che [4][MAX_ELEM_ID]

ChannelElement *	tag_che_map [4][MAX_ELEM_ID]

int	tags_mapped

int	warned_remapping_once

temporary aligned temporary buffers
(We do not want to have these on the stack.)
INTFLOAT	buf_mdct [1024]

INTFLOAT	temp [128]

Computed / set up during initialization
AVTXContext *	mdct120

AVTXContext *	mdct128

AVTXContext *	mdct480

AVTXContext *	mdct512

AVTXContext *	mdct960

AVTXContext *	mdct1024

AVTXContext *	mdct_ltp

av_tx_fn	mdct120_fn

av_tx_fn	mdct128_fn

av_tx_fn	mdct480_fn

av_tx_fn	mdct512_fn

av_tx_fn	mdct960_fn

av_tx_fn	mdct1024_fn

av_tx_fn	mdct_ltp_fn

AVFloatDSPContext *	fdsp

int	random_state

Members used for output
SingleChannelElement *	output_element [MAX_CHANNELS]
	Points to each SingleChannelElement. More...

Japanese DTV specific extension
int	force_dmono_mode
	0->not dmono, 1->use first channel, 2->use second channel More...

int	dmono_mode
	0->not dmono, 1->use first channel, 2->use second channel More...

Detailed Description

main AAC decoding context

Definition at line 186 of file aacdec.h.

Field Documentation

◆ class

const struct AVClass* AACDecContext::class

Definition at line 187 of file aacdec.h.

◆ avctx

struct AVCodecContext* AACDecContext::avctx

Definition at line 188 of file aacdec.h.

Referenced by aac_decode_er_frame(), aac_decode_frame(), aac_decode_frame_int(), aac_decode_init(), apply_dependent_coupling(), apply_dependent_coupling_fixed(), apply_intensity_stereo(), che_configure(), check_n_master(), decode_band_types(), decode_cpe(), decode_extension_payload(), decode_fill(), decode_ics(), decode_ics_info(), decode_prediction(), decode_scalefactors(), decode_spectrum_and_dequant(), decode_tns(), frame_configure_elements(), get_che(), latm_decode_audio_specific_config(), latm_decode_frame(), output_configure(), parse_adts_frame_header(), pop_output_configuration(), read_audio_mux_element(), read_sbr_data(), read_sbr_envelope(), read_sbr_extension(), read_sbr_grid(), read_sbr_noise(), read_stream_mux_config(), sbr_hf_calc_npatches(), sbr_hf_gen(), sbr_make_f_derived(), sbr_make_f_master(), sbr_mapping(), sbr_reset(), skip_data_stream_element(), and spectral_to_sample().

◆ frame

struct AVFrame* AACDecContext::frame

Definition at line 189 of file aacdec.h.

Referenced by aac_decode_er_frame(), aac_decode_frame_int(), and frame_configure_elements().

◆ is_saved

int AACDecContext::is_saved

Set if elements have stored overlap from previous frame.

Definition at line 191 of file aacdec.h.

◆ che_drc

DynamicRangeControl AACDecContext::che_drc

Definition at line 192 of file aacdec.h.

Referenced by decode_extension_payload().

◆ che

ChannelElement* AACDecContext::che[4][MAX_ELEM_ID]

Definition at line 198 of file aacdec.h.

Referenced by aac_decode_close(), apply_channel_coupling(), che_configure(), flush(), frame_configure_elements(), get_che(), output_configure(), and spectral_to_sample().

◆ tag_che_map

ChannelElement* AACDecContext::tag_che_map[4][MAX_ELEM_ID]

Definition at line 199 of file aacdec.h.

Referenced by get_che(), and output_configure().

◆ tags_mapped

int AACDecContext::tags_mapped

Definition at line 200 of file aacdec.h.

Referenced by aac_decode_er_frame(), aac_decode_frame_int(), and get_che().

◆ warned_remapping_once

int AACDecContext::warned_remapping_once

Definition at line 201 of file aacdec.h.

Referenced by get_che().

◆ buf_mdct

INTFLOAT AACDecContext::buf_mdct[1024]

Definition at line 209 of file aacdec.h.

Referenced by apply_ltp(), imdct_and_windowing(), imdct_and_windowing_960(), imdct_and_windowing_eld(), imdct_and_windowing_ld(), and update_ltp().

◆ temp

INTFLOAT AACDecContext::temp[128]

Definition at line 210 of file aacdec.h.

Referenced by imdct_and_windowing(), and imdct_and_windowing_960().

◆ mdct120

AVTXContext* AACDecContext::mdct120

Definition at line 217 of file aacdec.h.

Referenced by aac_decode_close(), aac_decode_init(), and imdct_and_windowing_960().

◆ mdct128

AVTXContext* AACDecContext::mdct128

Definition at line 218 of file aacdec.h.

Referenced by aac_decode_close(), aac_decode_init(), and imdct_and_windowing().

◆ mdct480

AVTXContext* AACDecContext::mdct480

Definition at line 219 of file aacdec.h.

Referenced by aac_decode_close(), aac_decode_init(), and imdct_and_windowing_eld().

◆ mdct512

AVTXContext* AACDecContext::mdct512

Definition at line 220 of file aacdec.h.

Referenced by aac_decode_close(), aac_decode_init(), imdct_and_windowing_eld(), and imdct_and_windowing_ld().

◆ mdct960

AVTXContext* AACDecContext::mdct960

Definition at line 221 of file aacdec.h.

Referenced by aac_decode_close(), aac_decode_init(), and imdct_and_windowing_960().

◆ mdct1024

AVTXContext* AACDecContext::mdct1024

Definition at line 222 of file aacdec.h.

Referenced by aac_decode_close(), aac_decode_init(), and imdct_and_windowing().

◆ mdct_ltp

AVTXContext* AACDecContext::mdct_ltp

Definition at line 223 of file aacdec.h.

Referenced by aac_decode_close(), aac_decode_init(), and windowing_and_mdct_ltp().

◆ mdct120_fn

av_tx_fn AACDecContext::mdct120_fn

Definition at line 225 of file aacdec.h.

Referenced by aac_decode_init(), and imdct_and_windowing_960().

◆ mdct128_fn

av_tx_fn AACDecContext::mdct128_fn

Definition at line 226 of file aacdec.h.

Referenced by aac_decode_init(), and imdct_and_windowing().

◆ mdct480_fn

av_tx_fn AACDecContext::mdct480_fn

Definition at line 227 of file aacdec.h.

Referenced by aac_decode_init(), and imdct_and_windowing_eld().

◆ mdct512_fn

av_tx_fn AACDecContext::mdct512_fn

Definition at line 228 of file aacdec.h.

Referenced by aac_decode_init(), imdct_and_windowing_eld(), and imdct_and_windowing_ld().

◆ mdct960_fn

av_tx_fn AACDecContext::mdct960_fn

Definition at line 229 of file aacdec.h.

Referenced by aac_decode_init(), and imdct_and_windowing_960().

◆ mdct1024_fn

av_tx_fn AACDecContext::mdct1024_fn

Definition at line 230 of file aacdec.h.

Referenced by aac_decode_init(), and imdct_and_windowing().

◆ mdct_ltp_fn

av_tx_fn AACDecContext::mdct_ltp_fn

Definition at line 231 of file aacdec.h.

Referenced by aac_decode_init(), and windowing_and_mdct_ltp().

◆ fdsp

AVFloatDSPContext* AACDecContext::fdsp

Definition at line 235 of file aacdec.h.

Referenced by aac_decode_close(), aac_decode_init(), apply_independent_coupling(), apply_intensity_stereo(), apply_mid_side_stereo(), decode_spectrum_and_dequant(), imdct_and_windowing(), imdct_and_windowing_960(), imdct_and_windowing_ld(), update_ltp(), and windowing_and_mdct_ltp().

◆ random_state

int AACDecContext::random_state

Definition at line 237 of file aacdec.h.

Referenced by aac_decode_init(), and decode_spectrum_and_dequant().

◆ output_element

SingleChannelElement* AACDecContext::output_element[MAX_CHANNELS]

Points to each SingleChannelElement.

Definition at line 244 of file aacdec.h.

Referenced by che_configure(), and frame_configure_elements().

◆ force_dmono_mode

int AACDecContext::force_dmono_mode

0->not dmono, 1->use first channel, 2->use second channel

Definition at line 252 of file aacdec.h.

Referenced by aac_decode_frame().

◆ dmono_mode

int AACDecContext::dmono_mode

0->not dmono, 1->use first channel, 2->use second channel

Definition at line 253 of file aacdec.h.

Referenced by aac_decode_frame(), aac_decode_frame_int(), and parse_adts_frame_header().

◆ output_channel_order

enum AACOutputChannelOrder AACDecContext::output_channel_order

Definition at line 256 of file aacdec.h.

Referenced by output_configure().

◆ oc

◆ warned_num_aac_frames

int AACDecContext::warned_num_aac_frames

Definition at line 259 of file aacdec.h.

Referenced by parse_adts_frame_header().

◆ warned_960_sbr

int AACDecContext::warned_960_sbr

Definition at line 260 of file aacdec.h.

Referenced by decode_extension_payload(), and decode_ga_specific_config().

◆ warned_71_wide

unsigned AACDecContext::warned_71_wide

Definition at line 261 of file aacdec.h.

Referenced by set_default_channel_config().

◆ warned_gain_control

int AACDecContext::warned_gain_control

Definition at line 262 of file aacdec.h.

Referenced by decode_ics().

◆ warned_he_aac_mono

int AACDecContext::warned_he_aac_mono

Definition at line 263 of file aacdec.h.

Referenced by decode_extension_payload(), and read_sbr_extension().

◆ imdct_and_windowing

void(* AACDecContext::imdct_and_windowing) (struct AACDecContext *ac, SingleChannelElement *sce)

Definition at line 266 of file aacdec.h.

Referenced by spectral_to_sample().

◆ apply_ltp

void(* AACDecContext::apply_ltp) (struct AACDecContext *ac, SingleChannelElement *sce)

Definition at line 267 of file aacdec.h.

Referenced by spectral_to_sample().

◆ apply_tns

void(* AACDecContext::apply_tns) (INTFLOAT coef[1024], TemporalNoiseShaping *tns, IndividualChannelStream *ics, int decode)

Definition at line 268 of file aacdec.h.

Referenced by apply_ltp(), and spectral_to_sample().

◆ windowing_and_mdct_ltp

void(* AACDecContext::windowing_and_mdct_ltp) (struct AACDecContext *ac, INTFLOAT *out, INTFLOAT *in, IndividualChannelStream *ics)

Definition at line 270 of file aacdec.h.

Referenced by apply_ltp().

◆ update_ltp

void(* AACDecContext::update_ltp) (struct AACDecContext *ac, SingleChannelElement *sce)

Definition at line 272 of file aacdec.h.

Referenced by spectral_to_sample().

◆ vector_pow43

void(* AACDecContext::vector_pow43) (int *coefs, int len)

Definition at line 273 of file aacdec.h.

Referenced by decode_spectrum_and_dequant().

◆ subband_scale

void(* AACDecContext::subband_scale) (int *dst, int *src, int scale, int offset, int len, void *log_context)

Definition at line 274 of file aacdec.h.

Referenced by apply_intensity_stereo(), and decode_spectrum_and_dequant().

The documentation for this struct was generated from the following file:

libavcodec/aacdec.h